Question

find the sum of first 50 terms of A.P=5,10,15,20​

Answer 1

Answer:

6375

Step-by-step explanation:

T50= 5 +( 50-1) x 5= 5 + 245=250

50th term is 250

Sum of 50 terms of the progression is (First term+Last term)/ 2 x Number of terms= (5+250)/ 2 x 50=6375

Hopefully the answer is correct

Answer 2

Answer:

formula to find sum of A. P :-

• Sn(no.of terms) :- n/2 [ 2a + (n-1) d]
• Given:- a1 = 5 , common diff. = 10-5= 5 , no. of terms :- 50
• put values informula :- 50/2 [ 2(5) + (50-1) 5]
• 25 [ 10+49(5) ]
• 25[ 10+245]
• 25 multiply 255
• now, sum of 1st 50 terms of A. P is : 6375