Question

If an APs first term is 1 and last term is 149. The sum of all terms is 5625 then number of terms is

Answer 1

Answer:

WE QRE GIVEN A = 1

AN = 149

SN = 5625

Step-by-step explanation:

WE KNOW THAT SN = N/2 (A + An )

5625 = N /2 ( 1 + 149)

5625 = N/2 (150)

5625 = N (75)

5625 = 75N

N = 5625 / 75

N = 75

THERE ARE 75 TERMS IN THE AP

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