1.

Solve this 1+2+3+_ _ _ _ _ _ _+21​

Answer»

Step-by-step explanation:

here

t1=1. d=1 TN=21. n=?

by using FORMULA ,

tn= a+(n-1)d

21= 1+(n-1)1

21=1+n-1

21=1-1+n

21 =n

n=21

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