a=5, d=3,an=50 find n&sn of the A p
Answers!
a=5 d=3 an=50 n=? Sn=?
An= a+ (n-1) d
So keeping the values and finding n
50= 5+(n-1)3
50-5=(n-1)3
45=(n-1)3
45/3=n-1
15=n-1
15+1=n
Hence n=16
Further sn formula is:
Sn=n/2[2a+(n-1)d)]
Putting the values
Sn= 16/2[2(5)+(16-1)3]
= 8 [10+15(3)]
= 8 [10+45]
= 8 [55]
Sn=440
Hence solved
Comment
Answer the question...
a=5 d=3 an=50 n=? Sn=?
An= a+ (n-1) d
So keeping the values and finding n
50= 5+(n-1)3
50-5=(n-1)3
45=(n-1)3
45/3=n-1
15=n-1
15+1=n
Hence n=16
Further sn formula is:
Sn=n/2[2a+(n-1)d)]
Putting the values
Sn= 16/2[2(5)+(16-1)3]
= 8 [10+15(3)]
= 8 [10+45]
= 8 [55]
Sn=440
Hence solved
An= a+ (n-1) d
So keeping the values and finding n
50= 5+(n-1)3
50-5=(n-1)3
45=(n-1)3
45/3=n-1
15=n-1
15+1=n
Hence n=16
Further sn formula is:
Sn=n/2[2a+(n-1)d)]
Putting the values
Sn= 16/2[2(5)+(16-1)3]
= 8 [10+15(3)]
= 8 [10+45]
= 8 [55]
Sn=440
Hence solved
Comment