Question

1+2+3........78 find the “n" value​

Answer 1

Answer:

answer is n

Step-by-step explanation:

nth value in AP= a+(n-1)d

a=1

d=1

so,

nth value = 1+(n-1)1

nth value=1+n-1

nth value=n

Answer 2

Answer:

n=78

Step-by-step explanation:

a=1, d=2-1=1, an=78, n=?

an=a+(n-1)d

78=1+(n-1)1

78=1+1n-1

78=1n

therefore,n=78/1

OR n=78