Find the value of 1+2+3.....120?
a. 21255
b. 22155
c. 22515
d. 22255
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Heya!!!
1+2+3.....120
It is an AP
As, common difference is same
Sum of all terns of AP=
n= number of terms
a= first term
an= last term
Firstly, we'll find n.
an = a + (n-1)d
120 = 1+ (n-1)1
119= n-1
n= 120
Sum =
= 60(121)
= 7260
1+2+3.....120
It is an AP
As, common difference is same
Sum of all terns of AP=
n= number of terms
a= first term
an= last term
Firstly, we'll find n.
an = a + (n-1)d
120 = 1+ (n-1)1
119= n-1
n= 120
Sum =
= 60(121)
= 7260
jyotibatra19:
i have given the options below and your answer doesnt match any of my answer
may be options are wrong
this question come in govt exam so i dnt thnk so
oh
ok
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