Question

Find the sum of first 22 terms of an AP in which d=7 and 22nd term in 149​

Answer 1

Answer:

The sum of first 22 terms is 1661

Step-by-step explanation:

Given 22nd term is 149

Then,

a+21d=149

a+21(7)=149

        a=149-147

       a=2

Sum of 22 terms is =n/2(2a+(n-1)d)

                                =22/2(2(2)+21(7))

                                =11(4+147)

                                =11(151)

                                =1661

The answer is 1661

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Answer 2

149=a+(22-1)7

149=a+21×7

149=a+147

149-147=a

a=2

S22=n/2[2a+(n-1)d]

S22=22/2[2×2+(22-1)7]

S22=11[4+147]

S22=11×151

S22=1661