Question

FIND THE WRONG TERM IN SERIES::::
3, 5, 15, 50, 123, 253

Answer 1

a1=3

a2=5

a3=15

a4=50

a5=123

a6=253

as we can see

a3=a2*a1

15=5*3

similarly

a4=a3*a1+a2

a4=15*3+5=45+5=50

similarly

a5 =a4*a1+a3

a5=50*3+15=150+15=165

as we can see that  a5 should be 165 while  we have given 123 so 123 is wrong term in series

now to check a6 whether it is according to given series or not

a6=a5*a1+a4

a6=123*3+50

a6=369+50=419

number should be 419  while we can given 253

so number 123 and 253 does not belong to given series

Answer 2

Answer:

50

Step-by-step explanation:

Difference between the number is n^2+n

Here n = 1, 2, 3, 4, 5....