A boy saves 1P to-day, 2P tomorrow, 3P day after tomorrow. How much he can save in 12 days?
Answers
Answered by
15
Answer:
78
Step-by-step explanation:
1 + 2+ 3 + ...........................+ up to 12 days.
a = 1, d = 1
Sn = n[2a+(n-1)d] 2
(a)
= 6[2+(11)] =(13)6 = 78
I hope this helps! :D
Answered by
2
Answer
78
Step-by-step explanation:
given 1+2+3+- - - +12 days
a=1 , d=a2-a1=2-1=1
s(n)=n(2a+(n-1)d)
= 6(2+12-1)
= 6(13)
= 78
HOPE IT IS HELPFULL
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