*२,६,१०,१४,१८,२२,२६,३०,३४,३८,४२,४६,५०,५४,५८*यातील कोणत्याही ३ संख्यांची बेरीज ६० आली पाहिजे
बघू कोण सोडवते.
Answers
Answer:
Step-by-step explanation:
a2-ए 1 = 6-2 = 4
a3-A2 = 10-6 = 4
ए 4-a3 = 14-10 = 4
a5-ए 4 = 18-14 = 4
ए 6-ए 5 = 22-18 = 4
ए 7-ए 6 = 26-22 = 4
ए 8-ए 7 = 30-26 = 4
श्रृंखला के प्रत्येक दो आसन्न सदस्यों के बीच अंतर निरंतर और 4 के बराबर है
सामान्य रूप: a = a1 + (n-1) d
एक = 2 + (n-1) 4
a1 = 2 (यह 1 सदस्य है)
a = 30 (यह अंतिम / nth सदस्य है)
d = 4 (यह लगातार सदस्यों के बीच अंतर है)
n = 8 (यह सदस्यों की संख्या है)
परिमित श्रृंखला के सदस्यों का योग
एक परिमित अंकगणितीय प्रगति के सदस्यों के योग को अंकगणितीय श्रृंखला कहा जाता है।
हमारे उदाहरण का उपयोग करते हुए, योग पर विचार करें:
2 + 6 + 10 + 14 + 18 + 22 + 26 + 30
इस योग को (यहां 8) जोड़े जा रहे शब्दों की संख्या n ले कर जल्दी से पाया जा सकता है, प्रगति में पहली और आखिरी संख्या के योग से गुणा (यहां 2 + 30 = 32), और 2 से विभाजित करें:
n (एक + A1)
2
8 (2 + 30)
2
इस श्रृंखला के 8 सदस्यों का योग 128 है
यह श्रृंखला निम्नलिखित सीधी रेखा y = 4x + 2 से मेल खाती है
Nth तत्व का पता लगाना
a1 = a1 + (n-1) * d = 2 + (1-1) * 4 = 2
a2 = a1 + (n-1) * d = 2 + (2-1) * 4 = 6
a3 = a1 + (n-1) * d = 2 + (3-1) * 4 = 10
a4 = a1 + (n-1) * d = 2 + (4-1) * 4 = 14
a5 = a1 + (n-1) * d = 2 + (5-1) * 4 = 18
a6 = a1 + (n-1) * d = 2 + (6-1) * 4 = 22
a7 = a1 + (n-1) * d = 2 + (7-1) * 4 = 26
a8 = a1 + (n-1) * d = 2 + (8-1) * 4 = 30
a9 = a1 + (n-1) * d = 2 + (9-1) * 4 = 34
a10 = a1 + (n-1) * d = 2 + (10-1) * 4 = 38
a11 = a1 + (n-1) * d = 2 + (11-1) * 4 = 42
a12 = a1 + (n-1) * d = 2 + (12-1) * 4 = 46
a13 = a1 + (n-1) * d = 2 + (13-1) * 4 = 50
a14 = a1 + (n-1) * d = 2 + (14-1) * 4 = 54
a15 = a1 + (n-1) * d = 2 + (15-1) * 4 = 58
a16 = a1 + (n-1) * d = 2 + (16-1) * 4 = 62
a17 = a1 + (n-1) * d = 2 + (17-1) * 4 = 66
a18 = a1 + (n-1) * d = 2 + (18-1) * 4 = 70
a19 = a1 + (n-1) * d = 2 + (19-1) * 4 = 74
a20 = a1 + (n-1) * d = 2 + (20-1) * 4 = 78
a21 = a1 + (n-1) * d = 2 + (21-1) * 4 = 82
a22 = a1 + (n-1) * d = 2 + (22-1) * 4 = 86
a23 = a1 + (n-1) * d = 2 + (23-1) * 4 = 90
a24 = a1 + (n-1) * d = 2 + (24-1) * 4 = 94
a25 = a1 + (n-1) * d = 2 + (25-1) * 4 = 98
a26 = a1 + (n-1) * d = 2 + (26-1) * 4 = 102
a27 = a1 + (n-1) * d = 2 + (27-1) * 4 = 106
a28 = a1 + (n-1) * d = 2 + (28-1) * 4 = 110
a29 = a1 + (n-1) * d = 2 + (29-1) * 4 = 114
a30 = a1 + (n-1) * d = 2 + (30-1) * 4 = 118
a31 = a1 + (n-1) * d = 2 + (31-1) * 4 = 122
a32 = a1 + (n-1) * d = 2 + (32-1) * 4 = 126
a33 = a1 + (n-1) * d = 2 + (33-1) * 4 = 130
a2-e 1 = 6-2 = 4
a3-a2 = 10-6 = 4
e 4-a3 = 14-10 = 4
a5-e 4 = 18-14 = 4
e 6-e 5 = 22-18 = 4
e 7-e 6 = 26-22 = 4
e 8-e 7 = 30-26 = 4
shrrnkhala ke pratyek do aasann sadasyon ke beech antar nirantar aur 4 ke baraabar hai
saamaany roop: a = a1 + (n-1) d
ek = 2 + (n-1) 4
a1 = 2 (yah 1 sadasy hai)
a = 30 (yah antim / nth sadasy hai)
d = 4 (yah lagaataar sadasyon ke beech antar hai)
n = 8 (yah sadasyon kee sankhya hai)
parimit shrrnkhala ke sadasyon ka yog
ek parimit ankaganiteey pragati ke sadasyon ke yog ko ankaganiteey shrrnkhala kaha jaata hai.
hamaare udaaharan ka upayog karate hue, yog par vichaar karen:
2 + 6 + 10 + 14 + 18 + 22 + 26 + 30
is yog ko (yahaan 8) jode ja rahe shabdon kee sankhya n le kar jaldee se paaya ja sakata hai, pragati mein pahalee aur aakhiree sankhya ke yog se guna (yahaan 2 + 30 = 32), aur 2 se vibhaajit karen:
n (ek + a1)
2
8 (2 + 30)
2
is shrrnkhala ke 8 sadasyon ka yog 128 hai
yah shrrnkhala nimnalikhit seedhee rekha y = 4x + 2 se mel khaatee hai
nth tatv ka pata lagaana
a1 = a1 + (n-1) * d = 2 + (1-1) * 4 = 2
a2 = a1 + (n-1) * d = 2 + (2-1) * 4 = 6
a3 = a1 + (n-1) * d = 2 + (3-1) * 4 = 10
a4 = a1 + (n-1) * d = 2 + (4-1) * 4 = 14
a5 = a1 + (n-1) * d = 2 + (5-1) * 4 = 18
a6 = a1 + (n-1) * d = 2 + (6-1) * 4 = 22
a7 = a1 + (n-1) * d = 2 + (7-1) * 4 = 26
a8 = a1 + (n-1) * d = 2 + (8-1) * 4 = 30
a9 = a1 + (n-1) * d = 2 + (9-1) * 4 = 34
a10 = a1 + (n-1) * d = 2 + (10-1) * 4 = 38
a11 = a1 + (n-1) * d = 2 + (11-1) * 4 = 42
a12 = a1 + (n-1) * d = 2 + (12-1) * 4 = 46
a13 = a1 + (n-1) * d = 2 + (13-1) * 4 = 50
a14 = a1 + (n-1) * d = 2 + (14-1) * 4 = 54
a15 = a1 + (n-1) * d = 2 + (15-1) * 4 = 58
a16 = a1 + (n-1) * d = 2 + (16-1) * 4 = 62
a17 = a1 + (n-1) * d = 2 + (17-1) * 4 = 66
a18 = a1 + (n-1) * d = 2 + (18-1) * 4 = 70
a19 = a1 + (n-1) * d = 2 + (19-1) * 4 = 74
a20 = a1 + (n-1) * d = 2 + (20-1) * 4 = 78
a21 = a1 + (n-1) * d = 2 + (21-1) * 4 = 82
a22 = a1 + (n-1) * d = 2 + (22-1) * 4 = 86
a23 = a1 + (n-1) * d = 2 + (23-1) * 4 = 90
a24 = a1 + (n-1) * d = 2 + (24-1) * 4 = 94
a25 = a1 + (n-1) * d = 2 + (25-1) * 4 = 98
a26 = a1 + (n-1) * d = 2 + (26-1) * 4 = 102
a27 = a1 + (n-1) * d = 2 + (27-1) * 4 = 106
a28 = a1 + (n-1) * d = 2 + (28-1) * 4 = 110
a29 = a1 + (n-1) * d = 2 + (29-1) * 4 = 114
a30 = a1 + (n-1) * d = 2 + (30-1) * 4 = 118
a31 = a1 + (n-1) * d = 2 + (31-1) * 4 = 122
a32 = a1 + (n-1) * d = 2 + (32-1) * 4 = 126
a33 = a1 + (n-1) * d = 2 + (33-1) * 4 = 130