Question

in an ap first term and last term are 4&61 sum is 650 find d​

Answer 1

a=4,an=61,d=?

Sn=650

Sn=n/2{a+an}

650=n/2{4+61}

650=n/2×65

650×2/65=n

10×2=n

20=n

n=20

now,

an=a+(n-1)d

61=4+(20-1)d

57=19d

3=d

d=3 Ans

hope it will help you