Which number will fit in '?' place in the following series?

 

12, 23, 45, 89, ?

 

What is the value of (91 + 92 + 93 + ......... +140)?

What is the value of 10.2+10.02+10.002+... upto 9 terms

What is the sum of first 40 terms of 1 + 3 + 4 + 5 + 7 + 7 + 10 + 9 + ....?

If N = 1 + 11 + 111 + 1111 + ... +111111111, then what is the sum of the digit's of N?

If A = 232, B = 231+ 230+ 229+ ... + 20and C = 315+ 314+ 313+ ... + 30, then which of the following option is TRUE?

If A = 1 – 10 + 3 – 12 + 5 – 14 + 7 + ... upto 60 terms, then what is the value of A?

Three numbers are in Arithmetic Progression (AP) whose sum is 30 and the product is 910. Then the greatest number in the AP is

What is the sum of the first 11 terms of an arithmetic progression if the first term is -31 and last term is 29?