India Languages, asked by lilthds, 1 year ago

8th term of an a.p is 37 and 15th term is 15 more than the 12th term . find the A.p hence find the sum of the A.p

Answers

Answered by gaurav2013c
9
First condition,

T8 = 37

=> a + 7d = 37 ------(1)

Second condition,

T15 - T12 = 15

=> a +14d - (a+11d) = 15

=> a + 14d - a - 11d = 15

=> 3d = 15

=> d = 5

On putting the value of d in equation 1, we get

a = 2


Required AP is 2,7,12,.........

Sn = n/2 [ 2*2 + (n-1)5]

= n/2 ( 4 +5n - 5)

= n/2 ( 5n - 1)

= (5n^2 - n) /2
Answered by misschocolate06
0

Answer:

expressing or meaning a refusal or denial. a negative answer. 2 lacking positive or affirmative qualities, such as enthusiasm, interest, or optimism. 3 showing or tending towards opposition or resistance

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